10) (x¹¹)²x⁷ (x⁵)³

$$\frac{(x^{11})^2 \cdot x^7}{(x^5)^3} = \frac{x^{11 \cdot 2} \cdot x^7}{x^{5 \cdot 3}} = \frac{x^{22} \cdot x^7}{x^{15}} = \frac{x^{22+7}}{x^{15}} = \frac{x^{29}}{x^{15}} = x^{29-15} = x^{14}$$

Ответ: x¹⁴